To track a device using Device Tracker Plus, you must have the app fully installed on the device you wish to locate, and your device must have a data plan or access to WiFi.
When the app is installed on a device, Device Tracker Plus will switch on the devices GPS at regular intervals and grab the location. These locations will then be listed in the location history section. The map will show the current location of the device. Remember if your device does not have access to WiFi or data, the Locate Now feature will show the location of the device when it last had access to WiFi or data.
Please be aware that Device Tracker Plus is not able to track through phone number, SMS or by the devices IMEI number.